Question

1. why did the use of tamil in hindu hymns lead to a rebirth of that religion in india?

tamil had always been the language of scholars and the royal court, so it gave hindu texts more status.
hymns written in tamil could be understood by more indians, who were inspired by the sacred texts.
tamil offered the hindu faith a standardized language, which it needed to compete with buddhism.
emperors were generally more sympathetic to people who spoke tamil, so they gave more support to hinduism.

Explanation:

Tamil - being a widely - spoken language in India, made Hindu hymns accessible to a larger audience. When more people could understand the sacred texts, it inspired them and contributed to a resurgence of Hinduism. Sanskrit was the traditional language of scholars and the royal court, not Tamil. Tamil was not a standardized language for Hinduism to compete with Buddhism, and there's no evidence that emperors favored Tamil - speakers in relation to supporting Hinduism.

Answer:

Hymns written in Tamil could be understood by more Indians, who were inspired by the sacred texts.